Wireless telegraphy.



No. 707,064, Patented Aug. l2, I902.

H. SHOEMAKER. WIRELESS TELEGRAPHY.

(Application filed June 1, 1901.]

(No Model.)

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UNITED tans ATENT FFICE.

HARRY SHOEMAKER, OF PHILADELPHIA, PENNSYLVANIA, ASSIGNOB OF ONE-HALF TOGUSTAVE P. GEHRING, OF PHILADELPHIA, PENNSYL- VANIA.

WIRELESS TELEG RAPHY.

SPECIFICATION forming part of Letters Patent BIO/707,064, dated August12, 1902.

Application filed June 1,1901. Serial No. 62,717. (No model.)

To all whom it may concern:

Be it known that I, HARRY SHOEMAKER, a citizen of the United States,residing at Philadelphia, in the county of Philadelphia and State ofPennsylvania, have invented certain new and useful Improvements inWireless 'lelegraphy, of which the following is a specification. i

This invention relates to improvements in wireless telegraphy; and themain object of my invention is the provision of an apparatus especiallyadapted for outdoor and long-distance work and one which will absolutelyprevent the feathering or the adhering to the silver plugs of thefilings in the coherers and an apparatus which will produce a dot anddash.

Another object of myinvention is the provision of a receiving apparatushaving a series of coherers in the main circuit, one docohering meansoperated to decohere one of the coherers as soon as the coherers losetheir resistance and the other decoherer operated as soon as thefirst-mentioned coherer again conducts. a

To attain the desired objects, myinvention consists of awireless-telegraph system embodying novel features of construction andarrangement of parts, substantially as disclosed herein.

In the drawingl have illustrated a diagrammatical View of an entiresystem of wireless telegraphy embodying my invention.

Referring to the drawing, A designates the airplate, connected by thewire 1 to the wire 2, this wire being connected to the wire 3, coherer4:, wire 5, wire 6, wire 7, coherer 8, wire 9, wire 10, and a condenser11, this constituting a portion of the main circuit and completing itwith the ground G by means of a wire 12. The main circuit, however, isnot directly through these Wires,but through wire 13, batteries 14, wire15, relay 16, wire 17, wire 18, electromagnet 19, and wire 20, which isconnected to wire 3. A resistance 21 is connected to wire 18, a wire 9of the coherer 8 being connected to said resistance. When the maincircuit is energized, the electromagnets 16 and 19 are magnetized, theelectromagnet 19 operating the lever 22, which is provided with thespring 23. When this lever is thus attracted, it contacts a post 24,which makes a circuit through the lever,wire 25, electromagnet 26, wire27, batteries 28, and wire 29, this circuit operating a decoheringdevice 26. When the main circuitis deenergized, the lever 22 is returnedby its spring to make another circuit through its post 31, wire 32,electromagnet 33, wire 34, batteries 28, and wire 29, this circuitoperating the decohering device WVhen a wave in the very first instantis received and before the coherers have fully conducted, theelectromagnet 19 is affected very slightly, but enough so through itsconnections with the coherers and air and ground to cause the lever 22to be moved slightly toward the electromagnet and out of contact withthe post 31, but not in contact with the post 24, thus breaking thecircuits of both of the decohering devices 26 and 33, which are thenfree to decohere the coherers i and 8, respectively, when the coherersboth fully conduct and after one of the coherers has been decohered.

The electromagnet 16 when energized attracts the lever 36, which makes acircuit through wire 37, batteries 38, and wire 39 to operate thesounder 40.

B designates a transmitting-station.

From this description it will beseen thatI have produced decoheringdevices which are adapted to be operated in succession and be dependentupon the waves as received by the receiving apparatus, this constructionbeing vastly different from the constructions set forth in myapplication filed May 13, 1901, Serial No. 60,010, in which I haveillustrated and claimed a series of coherers in the main circuit andindependent means for decohering.

The action in this arrangement orconstruction, as set forth in thisapplication, is such that when a wave is received both of the coherersconduct, closing the main relay 16 and the relay 19, which in turncloses the circuit of the magnet 26 and causes the coherer 4 to bedecohered. As soon as this action takes place the magnet 19 becomesdemagnetized and circuit is made with magnet 33, which in turn operatesthe decohering device of the coherer 8; but by this time coherer No. 4;again. conducts, and thus this action is re peated as long as the trainof waves is received,and the relay 16 is held over and causes thesounder to be operated to receive a dot or dash.

I would have it understood that I may employ any construction ofdecoherer, preferring, however, to use a magnetic decoherer instead ofthe tapping devices generally used.

From this description it is evident that I produce a wireless systemwhich will be absolutely sure in operation for a long distance oroutdoor purposes.

The wires 10 and 2 I have connected with a condenser, which is adaptedto prevent any current flowing from wire 9 to wire 20, but allows thewave to pass through the condenser, and my reason for employing theresistance 21 is to balance the magnet 19, to which it is equal. It willbe observed that the coherers 4 and 8arein the same main circuit,beingconnected in parallel, the coherer 4 being connected through relay 19and the coherer 8 through the inductive resistance 21, which, as I havementioned before, relay 19.

It is evident that I provide a system of wireless telegraphy having inits receivingstation a series of coherers, which are arranged inparallel and in the same main circuit. They are so arranged that whenthey conduct one decoherer is operated to decohere one of the coherers,and as the latter loses its resistance and conducts again, the remainingdecoherer is operated to decohere the other coherer; said decohererstherefore being dependent upon the operation of the coherers.

Having thus fully described my invention, what I claim as new, anddesire to secure by Letters Patent, is-

1. In a system of wireless telegraphy, a

transmitting and a receiving apparatus; said receiving apparatus,consisting of a series of coherers in the same main circuit and inparallel,andadecoheringdevice foreach coherer, said decohering devicesbeing dependent upon the action of the coherers, one being operated whenthe coherers conduct and the other when one of the coherers has beendecohered.

2. A receiving apparatus for wireless telegraphy, comprising a series ofimperfect electrical contacts, said contacts being in the same maincircuit, a relay in said main circuit,a receiving-instrument circuitcontrolled by the relay, another relay in said main circuit anddecohering devices adapted to be operated in succession as thelast-mentioned relay is magnetized and demagnetized.

3. A receiving apparatus comprising air and ground plates, a series ofcoherers in is equal to the 7 parallel and in circuit therewith, a relayin circuit with the coherers, a sounder-circuit operated by said relay,another relay in the coherer-circuit, and decohering means for eachcoherer adapted to be operated in succession as the last-mentioned relayis magnetized and demagnetized.

4:. A receiving apparatus comprising a series of coherers in paralleland in the same main circuit, a decoherer for each coherer, separatecircuits for each decoherer and a relay in said main circuit foroperating said decoherers one at a time in succession as the said relayis magnetized and demagnetized.

5. A receiving apparatus, comprising a series of coherers, air andground plates connected therewith, a main circuit embracing saidcoherers which are in parallel, a relay in said circuit, asounder-circuit operated by said relay, another relayin said maincircuit and a decoherer for each coherer adapted to be operated insuccession as the last-mentioned relay is magnetized and demagnatized.

6. In a receiver, a plurality of wave-responsive devices, a relaycontrolled by said devices, two circuits controlled by said relay, eachincluding a decohering device.

7. In areceiver, a plurality of wave-responsive devices, a relaycontrolled by said devices, a decoherer-circuit operated upon theenergization of said relay, and a decoherercircuit closed upon thedenergization of said relay.

8. In a receiver, a plurality of wave-responsive devices, a relaycontrolled by one of said devices, a decohering device for thewaveresponsive device controlling said relay, actuated upon theenergization of said relay, and a decoherer-circuit closed upon thedeenergization of said relay 9. A plurality of wave-responsive devices,a recorder-relay controlled thereby, a second relay controlled by aportion of said waveresponsive devices,a decoherer actuated upon theenergization of the second relay, and decohering means for the remainingwave-responsive devices actuated upon the restoration of saidfirst-mentioned portion.

10. In areceiver,a plurality of wave-responsive devices connected inparallel, an automatic decoherer for a portion of said devices, andmeans operative upon the restoration of said portion of said devices todecohere the remaining wave-responsive devices.

In testimony whereof I affix my signature in presence of two witnesses.

HARRY SHOEMAKER.

Witnesses:

M. WIEGAND, E. PICARD.

